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Investment In Associate - Summary Of Financial Information For Iso Energy (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Detailed Information About Financial Information [Line Items]      
Cash $ 290,743 $ 134,447 $ 201,804
Marketable securities 0 5,775  
Total assets 1,007,425 554,560  
Current liabilities 27,912 16,567  
Total liabilities 187,406 99,143  
Loss from operations 70,168 (60,268)  
Other comprehensive loss (2,422) (2,930)  
Total comprehensive loss 67,746 (63,198)  
IsoEnergy Ltd. [member]      
Disclosure Of Detailed Information About Financial Information [Line Items]      
Cash 37,033 19,913  
Other current assets 1,192 212  
Marketable securities 17,036 5,775  
Non-current assets 291,937 71,215  
Total assets 347,198 97,115  
Current liabilities 3,617 2,622  
Non-current liabilities 40,561 28,273  
Total liabilities 44,178 30,895  
Loss from operations 18,689 7,375  
Other comprehensive loss 2,618 2,993  
Total comprehensive loss $ 21,307 $ 10,368